An investor purchased 670 shares of a stock at $73.20 per share. Then he sold the stock at $82.35. If the broker's commission was 2.5% on the purchase and sale of the stocks, how much money did the investor make or lose on the transaction? Use a negative number to indicate a loss. The investor made/lost $ Find the buyer's percent return per year for the bond purchase in Exercise 6 if it were bought 672 years after being issued. Buyers percent return per year = %